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Finding the Fourth Proportional to 30.40, 46.40 and 30.40

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Solution

The fourth proportional to 30.40, 46.40 and 30.40 is: 46.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.40 : 46.40 = 30.40 : x
  2. Step 2: Convert to fraction form
    30.40/46.40 = 30.40/x
  3. Step 3: Cross multiply
    30.40x = 46.40 × 30.40
  4. Step 4: Simplify right side
    30.40x = 1,410.56
  5. Step 5: Solve for x
    x = 1,410.56/30.40
  6. Step 6: Final answer
    x = 46.40

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.